.page-mask {
  position: fixed;
  left: 0;
  bottom: 0;
  right: 0;
  top: 0;
  background: rgba(0, 0, 0, 0.4);
  animation: fade 0.35s ease;
  z-index: 1000;
}
@keyframes fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
